I'm with you on this one, most of my driving is in the 2k range, especially since I mostly do city driving. Maybe we accelerate slower than everyone else?

 

I understand that but did not have the drone until I put the HFC's on....

 

Thats what opening up the air flow does to the exhaust. Headers and HFC will typically add some drone. Not much else you can do about it. They are worth the cost in performance alone. Aside from the drone the sound is great.

 

I don't think I felt any performance gains. I had the full length Injen on and due to water issues near work I made it the shorty style and put a 9" filter on the end, changed the spark plugs to the Iridium 4469's and put the HFC's on; was wondering if I need to get the car re-tuned.....

I know the Berk's weigh a lot less than the stock cats!